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                [TJOI2015]旅游                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：256MB</p>			</div>
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                                <h3>题目描述</h3><p><div>为了提高智商，ZJY准备去往一个新世界去旅游。这个世界的城市布局像一棵树。每两座城市之间只有一条路径可</div>
<div>以互达。每座城市都有一种宝石，有一定的价格。ZJY为了赚取最高利益，她会选择从A城市买入再转手卖到B城市</div>
<div>。由于ZJY买宝石时经常卖萌，因而凡是ZJY路过的城市，这座城市的宝石价格会上涨。让我们来算算ZJY旅游完之</div>
<div>后能够赚取的最大利润。（如a城市宝石价格为v，则ZJY出售价格也为v）</div></p><hr/><h3>输入格式</h3><p><div>第一行输入一个正整数N，表示城市个数。</div>
<div>接下来一行输入N个正整数表示每座城市宝石的最初价格p，每个宝石的初始价格不超过100。</div>
<div>第三行开始连续输入N-1行，每行有两个数字x和y。表示x城市和y城市有一条路径。城市编号从1开始。</div>
<div>下一行输入一个整数Q，表示询问次数。</div>
<div>接下来Q行，每行输入三个正整数a,b,v，表示ZJY从a旅游到b，城市宝石上涨v。</div>
<div>1&le; N&le;50000， 1&le;Q &le;50000</div>
<div></div></p><hr/><h3>输出格式</h3><p><p>&nbsp;对于每次询问，输出ZJY可能获得的最大利润，如果亏本则输出0。</p>
<div></div></p><hr/><h3>样例输入</h3><pre>3
1 2 3
1 2
2 3
2
1 2 100
1 3 100</pre><hr/><h3>样例输出</h3><pre>1
1</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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